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LG OLED48CX Review

Has LG had to compromise anything other than screen inches to deliver its smallest OLED TV ever?

Verdict

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Trusted Reviews Recommended

The LG OLED48CX combines fantastic picture quality and good sound with the most comprehensive gaming-friendly connectivity around. It’s fantastic to see LG refusing to compromise performance for its smallest ever OLED TV. The only problem is that at the time of review, the OLED48CX costs more than its 55-inch sibling. So for most people, the OLED55CX surely looks the better bet.

Pros

  • Beautiful picture quality
  • Strong sound quality
  • Class-leading gaming features

Cons

  • Costs more than 55-inch version
  • Care needs to be taken to avoid screen burn
  • Missing most of the UK catch up apps

Key Specifications

  • Review Price: £1499
  • 48-inch OLED TV
  • Native 4K resolution
  • Four HDMI 2.1 ports
  • 4K at 120Hz and VRR playback support
  • HDR10, HLG and Dolby Vision HDR support

The LG 48 CX (OLED48CX) is the smallest LG OLED TV ever. In fact, it’s the smallest OLED TV since Sony debuted the not-exactly-mainstream 11-inch XEL-1 way back in 2008.

Knocking seven inches off LG’s previous smallest OLED opens the door to OLED technology being adopted by a whole new audience of spatially challenged AV fans and serious video gamers.

Price and availability

At the time of review, the 48-inch model of the LG CX OLED could be bought for £1499/$1499/€1800/CAD$1969/AUD$2799. Prices have dropped a little more in the UK, where you can currently obtain the OLED for £1299.

Design

  • Excellent build quality for a small TV

  • Good ‘magic’ remote

The OLED48CX doesn’t look quite as glamorous as its bigger siblings (including the 55-inch model). This is because the chunky section on its rear that holds its processing, panel drivers, speakers and connections takes up a larger proportion of its chassis than it does on the bigger sets. The metal-rich build quality is excellent for such a small TV, though.

LG 48 CX OLED

The screen is joined by one of LG’s ‘Magic’ remote controls. Its black plastic finish isn’t anything special, but it’s comfortably shaped and its unusual ‘point and click’ and spinning menu wheel button options make it a more flexible and friendly handset than most. It’s good, too, to find dedicated buttons on the remote for Netflix and Amazon Prime Video.

Features

  • Support for the latest gaming features

  • New picture modes in Dolby Vision IQ and Filmmaker Mode

  • Blazing fast input lag for gaming

The star attraction of the LG 48 CX is that it gives you the picture quality joys of OLED’s self-emissive pixel technology at a new, smaller screen size. Until recently, it could also boast that it was cheaper than the 55-inch OLED55CX. However, the bigger model has recently had its price reduced to just £1,399 at many online retailers.

The OLED48CX still manages to fit a full native 4K pixel count into its relatively small screen. Plus it supports high dynamic range in the standard HDR10, broadcast-friendly HLG and premium Dolby Vision formats. LG still won’t entertain support for the HDR10+ format which, like Dolby Vision, adds extra scene-by-scene image data to the HDR stream.

Another big selling point of the LG 48 CX is its connectivity. All four of its HDMIs support the latest 2.1 standard with data rates up to 40Gbps. Enough to cope with all the key 4K@120Hz and variable refresh rate features we’re expecting to see from the Xbox Series X and PS5 consoles. In fact, after a few teething problems, these features are already being exploited by Nvidia’s new RTX 3080 graphics cards.

The OLED48CX can support Nvidia’s G-Sync and AMD’s Freesync VRR systems (the latter of which the Xbox Series X will use) and the standard HDMI 2.1 VRR system.

LG 48 CX OLED

LG’s 2020 OLEDs are the only current TVs that offer such fulsome gaming support, with other sets either not having enough data bandwidth in their HDMIs, or else only providing one or two ‘full’ HDMI 2.1 ports.

Driving the OLED48CX’s new OLED panel is LG’s Alpha 9 Generation 3 processor. While this is more of an evolution over its 2019 predecessor than a revolution, it does bring a few picture processing improvements of note. Namely a new face enhancement tool, new AI-boosted upscaling of sub 4K sources, a new tool for smoothing the jagged edges of onscreen text, and a new Auto Genre selection tool that helps it optimise its pictures to different content types.

There are also audio benefits from the new processor – in particular improved virtual 5.1 upmixing that delivers a much wider sound, and improved vocal clarity.

The LG 48 CX boasts a couple of intriguing new picture preset options, too. Filmmaker Mode applies settings that the independent UHD Alliance thinks deliver pictures that look as close as possible to the way they were mastered by their creators. Dolby Vision IQ, meanwhile, combines the extra picture information Dolby Vision provides with analysis of light levels in your room, so that images retain the brightness and impact they had when created in dark mastering studios. Note that Dolby Vision IQ is activated on LG OLED TVs by selecting their Dolby Vision Cinema Home mode.

The only substantial disappointment with the OLED48CX’s features is its lack of most of the UK’s key terrestrial broadcaster catch up apps. For some reason LG and Freeview Play weren’t able to renew their customary deal this year, leaving LG having to try and get the likes of the BBC iPlayer, ITV Hub and All 4 on board individually.

Performance

  • Pretty much the same PQ as bigger sizes

  • Can lack sharpness due to its smaller size

  • Still susceptible to potential burn-in

Happily LG’s latest outstanding OLED picture performance holds up pretty much unchanged on this new groundbreakingly small TV.

Black levels are still profoundly good. Deep, rich, neutral and more stable – in terms both of video noise and gamma shifts – than they’ve looked on any previous LG OLED generation. There’s more shadow detail in the darkest areas too than there was with last year’s OLED models. This makes films feel more consistent as they switch between bright and dark shots, and makes it easier to spot potential dangers lurking in dark video game corners.

The profound blacks provide a lovely foundation for colours to bounce off, resulting in pictures that look just as dynamic and intense as those of LG’s bigger OLEDs. Especially with HDR/wide colour content.

LG 48 CX OLED

In fact, the LG 48 CX delivers the same sort of brightness measurements – 750-800 nits – on a 10% white HDR window that the bigger screens do. This combination of deep blacks, punchy bright highlights and OLED’s ability to have each pixel deliver its own light leads to images of really gorgeous local contrast and lighting precision.

Colours are every bit as rich, vibrant, but also precise, balanced and consistent across the screen as those of the bigger CX models. Viewing angles are as typically excellent as you’d expect from OLED technology, and the OLED48CX also retains the improved motion reproduction LG has finally delivered for 2020.

In fact, the screen maintains all of the same individually small but cumulatively important enhancements across various picture areas that make the CX series models superior picture performers to their 2019 predecessors.

The only area of the OLED48CX’s picture performance that does suffer – marginally – from its relatively small size is its 4K sharpness. From typical living room viewing distances you don’t feel as much impact from its 4K pixel count as you do on LG’s bigger OLED screens.

This is only to be expected, really. It’s well established that higher screen resolutions deliver more impact on bigger screens, so the slightly reduced sharpness impact is a simple function of its screen size rather than related to any performance deficiencies.

Note that this issue largely disappears if you sit much closer to it than you would a regular TV – which is exactly what some video gamers will be doing. So gamers will still feel the benefit of the resolution – as well as all the other high frame rate, HDR and variable refresh rate features the LG 48 CX supports.

As noted earlier, there were a few teething troubles with the OLED48CX’s compatibility with Nvidia’s new RTX 30 graphics cards. LG has set about fixing these impressively quickly, suggesting a strong commitment to keeping the goodwill of the new gaming fanbase the capabilities of the CX series has unlocked.

There is also still an issue with a slight gamma shift with all VRR systems active that slightly raises black levels. LG is working on a fix for this, too, but admits that this one will take longer to achieve.

As with any display that deploys organic technology, the LG 48 CX is potentially susceptible to screen burn. A problem where prolonged exposure to intense static image elements can lead over time to shadows of those elements remaining permanently on screen.

LG’s panel design seems to reduce the potential of this happening with every passing year, though, and the OLED48CX carries numerous features designed to combat the problem. But it’s something to bear in mind if you regularly put in marathon sessions on games with static onscreen elements. Maybe try to switch between different games rather than just playing the same one all the time.

Audio quality

  • Same configuration as bigger models

  • Powerful sound for a small TV

  • Hard-hitting soundtracks can cause distortion

The OLED48CX carries built-in Dolby Atmos decoding, delivered in this case by a 40W speaker system in a 2.2-channel configuration. Happily this is the same power and configuration that you get in the 55-inch model.

Naturally the 2.2-channel configuration means there are no ‘real’ up-firing, side-firing or rear speakers to distribute Dolby Atmos soundtracks around, meaning the set needs to rely on virtual speaker processing for height effects. Perhaps because of this, combined with LG having more intimate knowledge of the capabilities of its TV’s speakers than Dolby, I personally preferred the LG’s AI Sound setting to the default Dolby Atmos one. The results are more powerful and room filling. In fact, they’re seriously impressive for such a small TV.

There is a limit to how much the virtualisation processing can achieve. You need to think of the sound as a more of a flat wall than a truly three-dimensional soundscape. But at least that wall has height as well as width, and there’s plenty of well-placed detailing within it.

Heavy, persistent bass sounds can cause some crackle, distortion and drop outs from the 48CX’s two woofers. But this is true of the bigger CX models too, and while it’s distracting when it happens, it only does so with pretty extreme soundtracks.

You should buy it if…

  • You have less space for the full-sized OLED

Some people maybe really can only fit a 48-inch TV into their room. If that’s the only way to get the virtues of OLED in your home, this 48-inch model is one of few choices in the market.

  • You’re a big gamer

Like its full-sized siblings, the 48-inch CX is big on gaming, carrying over all the features fond on the bigger model. And, as a result of it being smaller, gamers can sit closer to the screen.

You shouldn’t buy it if..

  • You can spring for the bigger model

The fact that, at the time of writing, you can actually buy the 55-inch OLED55CX for £90 less than the OLED48CX presents the smaller model with quite a problem. For most TV fans, though, the bigger, cheaper screen is surely going to look like the more sensible option.

  • You use Freeview Play

LG’s TVs ae still missing some of the UK catch-up apps with only iPlayer, ITV Hub and All4 available so far.

 

FAQs

Can I use voice control with this TV?

Yes, the LG OLED48CX remote control has built-in voice control.

Does it have Freeview Play?

No, the LG OLED48CX does not have Freeview Play.

What HDR formats does it support?

The LG OLED48CX supports HDR10, HLG and Dolby Vision formats.

Specifications

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Jargon buster

Dolby Vision

Dolby Vision is a variant of HDR, adding a layer of dynamic metadata to the core HDR signal. This dynamic metadata carries scene-by-scene (or frame-by-frame) instructions from content creators on how a TV should present the images to improve everything from brightness to contrast, detailing and colour reproduction.

HLG (Hybrid-Log Gamma)

HLG is a HDR format co-developed by the BBC and Japanese national broadcaster NHK for transmission of broadcast and live streamed content in HDR. It’s backwards compatible with SDR transmission standards, enabling people without a HDR TV to receive the same feed but downsampled.

OLED

Organic Light Emitting Diode is panel technology that allows each individual pixel to produce light rather than relying on a backlight. This enables the screen to accurately display blacks by turning off the pixel, resulting in improved contrast compared to conventional LCD panels.

Filmmaker Mode

Filmmaker Mode is a picture mode supported by some TV manufacturers that disables post-processing features (e.g. motion smoothing), and preserves the correct aspect ratios, colours and frame rates that respects the original author’s creative intent.

Upscaling

Upscaling refers to the process whereby a TV receives an image lower than its native resolution and fills in the missing information to create an image. Upscaling effectively guesses which pixels go where to make up the new image. The better the upscaler, the better the resulting image and with the advent of artificial intelligence, it has helped to make for more sophisticated guesses.

eARC

eARC (Enhanced Audio Return Channel) is the update to ARC and it boosts the bandwidth and speed, making room for object-based audio surround formats such as DTS:X and Dolby Atmos to be sent directly to an AV receiver/soundbar.

Dolby Vision IQ

Dolby Vision IQ is an advanced version of the standard Dolby Vision signal. It uses the metadata within its own HDR signal in conjunction with a TV’s light sensor to detect how bright or how dark a room is in order to optimise the picture quality so content retains consistent luminance (brightness) and detail no matter how bright or dark the room is.

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